Match each concrete role or effect to the structure responsible.

• Keeps your heart beating and lungs breathing automatically → Medulla
• Filters incoming stimuli and decides what wakes you up → Reticular formation
• Makes a practiced motion like signing your name smooth and automatic → Cerebellum
• Relays signals between cerebrum and cerebellum and helps regulate sleep → Pons

Automatic vital control is the medulla, arousal-filtering is the reticular formation, smooth skilled movement is the cerebellum, and the cerebrum-cerebellum relay is the pons. Each role identifies one structure of the old brain.